package com.tiger.web;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class HttpServletRequestHolder implements Filter {
	private static ThreadLocal<HttpServletRequest> holder = new ThreadLocal<>();

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		if(request instanceof HttpServletRequest) {
			holder.set((HttpServletRequest)request);
			chain.doFilter(request, response);
			holder.remove();
		} else {
			chain.doFilter(request, response);
		}
	}

	@Override
	public void destroy() {
	}
	
	public static HttpServletRequest get() {
		return holder.get();
	}

}
